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The Norfolk Broads Forum / Broads Boat Owners Q & A / Diesel heaters
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Posted By Discussion Topic: Diesel heaters

Similar Threads That Might Help :
Diesel Heaters - But Which Type ????| Advice on fitting a diesel heater| Advice on fitting a diesel heater| Advice on fitting a diesel heater| Wanted - Webasto/Eberspacher diesel heater|

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Regulo
Oct-05-2020 @ 12:55 PM                           Permalink
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Mardles sometimes
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ADI, please inspect that exhaust silencer for gas tightness. Take it off, cover one end and blow through the other, should not leak at the sides. It should be OK if it's for marine use. Similar shaped ones for automotive use are NOT gas sealed as they are designed to be fitted externally.
See here: http://the-norfolk-broads.co.uk/viewmessages.cfm?Forum=22&Topic=37743&keywords=exhaust

This message was edited by Regulo on Oct-5-20 @ 7:28 PM

ADI
Oct-05-2020 @ 8:29 PM                           Permalink
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Ray I can confirm it leaks like a sieve as on start up smoke was coming out of all the edges, I was thinking of soldering it with blow torch but not sure if it will take to the stainless (if that is what it is) or sealing it with Fire Mate Intumescent Acrylic Sealant with a u shaped channel slotted over the joint, either way I will make it safe and test it, having said that do I even have to use it could I just take the straight pipe to the skin fitting. I suppose a bit of sealant on all exhaust joints is required too.

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Adrian  Michelle

Beck  Braydon and Mere.

Regulo
Oct-05-2020 @ 9:40 PM                           Permalink
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You can buy sealed marine units. I wouldn't take the risk of anything you do coming apart, leaving it leaking exhaust fumes into the boat. It's just not worth it. My original install just had the exhaust going straight through with no silencer. When I fitted the silencer, I really couldn't hear any difference. Probably quieter outside to the listening public!!

Regards, Ray.

Whatever happens now, I'm blaming it on Brexit. Everyone else is!


This message was edited by Regulo on Oct-5-20 @ 9:43 PM

annville
Oct-06-2020 @ 10:37 AM                           Permalink
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Hi Adi Yes i always use lubricant on connections, ref the heater just be aware the the silencer is also a condensation trap you will find a small hole in the bottom of silencer thats to let the water out otherwise as the exhaust pipe rises water could run back into the combustion chamber, at that price a very good deal what output is it? John

Regulo
Oct-06-2020 @ 12:32 PM                           Permalink
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quote:"......
the silencer is also a condensation trap you will find a small hole in the bottom of silencer thats to let the water out otherwise as the exhaust pipe rises water could run back into the combustion chamber
......."


Is this right? Surely only on external silencers? You'll be leaking exhaust gas into the boat if that's fitted internally. Needs seriously looking into. It may be why the automotive ones aren't sealed, the openings allow for condensation draining?

Regards, Ray.

Whatever happens now, I'm blaming it on Brexit. Everyone else is!


This message was edited by Regulo on Oct-6-20 @ 12:34 PM

L'sBelles
Oct-06-2020 @ 3:32 PM                           Permalink
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When I thought I needed a diesel heater for our boat I spoke with a chap who reconditions Webasto and Eberspachers who appeared very knowledgable about the subject. He advised that heaters designed for use in road vehicles are not suitable for marine use and despite losing a sale he would not sell me one of the units he had in stock as in his opinion it was not suitable. The silencer is just one of the issues but there are others like units that are intended for road use have altitude compensation apparently. Cannot see much use for that if you are always at sea level! There may be other differences but cannot remember all of what he said off the top of my head. The OP may be able to cobble something together out of the bits he has but whether or not it is reliable or efficient I would not like to guess.

ADI
Oct-06-2020 @ 10:22 PM                           Permalink
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Is this the kind of silencer you have Ray? marine silencer thinking a straight pipe through might be best, less joints to seal.

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Adrian  Michelle

Beck  Braydon and Mere.

ADI
Oct-06-2020 @ 10:30 PM                           Permalink
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John I will have a close look at the silencer for a drain hole, its a 8kw heater.

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Adrian  Michelle

Beck  Braydon and Mere.

ADI
Oct-06-2020 @ 10:36 PM                           Permalink
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L'sBelles I know there really efficient but not sure about reliability but am hopeful.

Regards

Adrian  Michelle

Beck  Braydon and Mere.

Regulo
Oct-06-2020 @ 11:20 PM                           Permalink
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Yes, Adi, that's the one. I don't remember paying that much, but it did seem expensive at the time! To be honest, I'd fit it without a silencer, and see how it goes. It's not a great deal of trouble to fit one at a later date, if you deem it necessary. As I said, I really couldn't say it made much difference inside the boat. Probably quietens it down to the outside audience, but as I'm never out there when it's running - who cares?  Smile

Regards, Ray.

annville
Oct-07-2020 @ 10:54 AM                           Permalink
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Hi Often the difference with marine and road/caravan is the material that they are constructed from caravan cookers are a classic example caravan one's  steel that rusts or boat one's brass/stainless that doesn't, the silencers that are shown are round and i guess are road use,  boat one's that i have seen and the one on my last Eberspacher was/are square with a drain hole and made from heavy metal coated, and the through hull fitting, has a air/heat gap between the hull plate and the exhaust pipe to stop heat transfer to the hull,   the pipe is flexible stainless steel held on by a clamp to the heater, silencer and hull fitting, road vehicles wouldn't need this, as an aside they were invented during the last war by the Germans to heat there tanks whilst stationary to stop them freezing up in Russia, so been around a long time, then used on coaches and lorrys. John

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